Question

Rozwiąż równania: a)(x-2)(x+2)=2(x+1)^2 -(x-3)^2 -7

Answer 1

(x-2)(x+2)=2(x+1)^2-(x-3)^2-7

x²+2x-2x-4=2(x²+2x+1)-(x²-6x+9)-7

x²-4=2x²+2x+1-x²+6x-9-7

x²-4=x²+8x-1

8x=-3 |:8

x=-⅜